Keystones — Capstone
Five GCSE retrieval questions · 3 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√150
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 5
Answer: 4(x - 4)² - 59 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 65°. Give your answer to 2 decimal places
Answer: 154.07cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 18:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 63, 47, 23, 11, 52, 68. Give your answer to 2 decimal places
Answer: Mean = 46.14, Median = 52, Range = 57